sequence showing a large circular saw cutting through a chunk of slate at a slate quarry with water pouring off it to suppress the dust, wales; 1974 - 國家板岩博物館 個影片檔及 b 捲影像00:10
pan left disused buildings at a derelict slate quarry at blaenavon, now part of the national slate museum in wales; 1974 - 國家板岩博物館 個影片檔及 b 捲影像00:11
sequence showing a mature man splitting slate into sheets using a chisel and mallet, wales; 1974 - 國家板岩博物館 個影片檔及 b 捲影像00:13